User manual

Global Physical
Drive Settings Description
Enable Write Cache
Helps optimize performance for multiple stream
backup, restoration and elimination of redundant
data (deduplication). Differs from controller-level
cache because physical drive write caches are not
protected. If power is lost or a drive is physically
removed from the array during operation, unwritten
data in the physical drive write caches will be lost.
Write caching is beneficial for write intensive
applications such as video editing that use large
amounts of temporary files or tend to write in bursts.
However, applications that continuously write large
amounts of data will fill up the cache, which can slow
down throughput. Enabled by default.
Enable Read Look
Ahead Cache
Can improve I/O performance for applications that
typically read data sequentially or on sequential
sectors. Enabled by default.
Enable Command
Queuing
Allows hard disks to optimize the order in which
read/write commands are executed. This minimizes
head movement to reduce physical drive wear, and
can improve performance. Enabled by default.
DMA Mode
Lets you choose the mode used for Direct Memory
Access controller of the physical disk.
Medium Error
Threshold
The number of bad blocks tolerated before the
controller marks a physical drive as Dead. By
enabling this setting, you can identify problem drives
before they fail, improving system performance and
reliability. The default setting is 0 (disabled).
Automatic Acoustic
Management
A method for reducing hard drive noise. This feature
will function only if the installed disk drives support
AAM. Enabled by default.
Automatic Acoustic
Level
Determines whether drives will put more emphasis
on noise reduction or performance. The default
setting is low noise.
Device > Physical Drive > Global Physical Drive Settings
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